Looping Content Continuously

We just purchased our first couple of DL-2 units a few months back and been
running into a problem with "Play forward looping continuously" of stock media content across all three layer Graphic Definitions.
The DMX value of 65,103, & 141 respectively of the graphics layer is "0" as outlined in the manual. We have varified that value via a DMX tool connected to the data line.
Any insight would greatly be appreciated.